I ordered a set of JDM Subaru exhaust finishers for my car... and only after I got them, did it click that they are designed for the JDM rear bar!!
The fitment is not perfect, so I will either have to bend the aluminium to suit, or cut the rear diffuser to suit.
sigh.
edit: the aluminium has a butted edge and is thick. Won't be bending that to suit! so it will just have to overhang.
double sigh.